Pulverizer



April 5; 1938. H. D. ANDERSCN 2,113,040

PULVERIZER Filed July 12, 1935 2 Sheets-Sheet l 3 Z "Y *T ,7 W 50 f x I /2 Z I Z .70 J 1 5 f;

INVENTOR. HEM? r D. H/YDERs o/v ATTORNEYS April 5, 1938. H, D, ANDIERSQN 2,113,040 PULVERI-ZER F'Iq. 4

INVENTOR. HENRY D H/YDERS 0/! ATTORNEY5 Patented Apr. 5, 1938 UNITED STATES PATENT OFFICE 2 Claims.

This invention relates-to pulverizers and particularly to those which are adapted for use in pulverizing coal, at the place of use. The invention has for one of its objects, the construction of a pulverizer which will be sufiiciently effective to pulverize coal to such an extent that it will pass through a 200 mesh sieve, if desired, and yet will be sufficiently simple in construction so as to have few operating parts that do not require frequent adjustment and that enable the entire device to be housed in a small compact structure.

Referring now to the drawings, Fig. 1 is a longitudinal section through a pulverizer made in accordance with my invention; Figs. 2 and 3 are sections taken on the correspondingly numbered lines in Fig. 1, and Fig. 4 is a top plan view of the pulverizer.

The pulverizer, which I have illustrated has a standard H], in which a. shaft II is journalled.

A hopper I2 is attached to the standard by securing members I3, and has a recess M for receiving one end of the shaft H. The material to be pulverized is fed into the hopper and is caused to flow in the direction indicated by the arrows by a worm l5 that is rigidly connected to the shaft II. The material is pulverized by being forced to fiow between two grinding members, such as discs [6 and H, which are preferably rotated in opposite directions; one of the discs I! being directly connected to the shaft through a collar l8 and the other being rigidly connected to a sleeve l9 which is freely movable on the shaft ll.

5 The shaft ll may be rotated by means of a sprocket wheel 20 which is keyed to the shaft and which is connected by a chain 2| to a sprocket pinion 22 on a motor shaft 23. The motor shaft has also rigidly fixed to it a pinion 24 40 which meshes with a gear 25 that is fixed to the sleeve [9. Thus, the motor by rotating in one direction causes rotation of the sprocket wheel 20 in the same direction, and causes rotation of the sleeve in the opposite direction. As the 45 wheel 20 drives the disc I1, and the gear 25 drives the disc I6, it is apparent that the two discs are caused to be rotated in opposite directions. The relation between the speed of the discs may be varied by varying the relationship 50 between the gears on the motor shaft and sleeve l9 respectively. For example, I have shown a two step gearing which comprises the gear 25 and a pinion 26 which may be driven by a pinion 24 and a gear 21 respectively, on the motor shaft. It is to be understood that when the pinion 24 is used, the gear 21 is removed from the motor shaft. 0n the other handwhen the gear 21 is used, then the pinion 24 is removed from the motor shaft.

To connect the disc I6 to the sleeve I9, I have shown the sleeve, as having lugs 30 which project laterally toward the hopper from a flange 50 that extends radially from the'sleeve adjacent the hopper end thereof. These lugs fit into correspondingly shaped openings 3| in the disc [6, 10 as is shown in Fig. 2, and thus provide a driving connection between the sleeve and disc. Similarly the collar l8 has lugs 32 which fit into correspondingly shaped recesses in the disc I! and which operate to provide a connection be- 15 tween the disc and collar. The collar has radially extending arms 33 between which are passageways 35 through which the material may flow from the hopper; similarly, the disc H has a hollow central portion which provides a passage 36 for conducting material from the passageway 35 into the space between the discs.

The pulverizing action is accomplished partly by means of ribs that are positioned on the contiguous faces of the discs, and partly by the 25 radial surfaces adjacent the periphery. To this end, the disc I6 is illustrated as having ribs 40 and the disc I1 is shown as having ribs 4|. Preferably the ribs extend obliquely on the face of the disc with leading edges insofar as the direc- 30 tion of rotation is concerned on the ends adjacent the axis of the shaft. The spaces between the ribs provide pockets into which the material is collected so as to facilitate utilization of the entire edges of the ribs for grinding purposes. 35

The ribs serve to break up the large particles of material before it is fed between the fiat grinding surfaces which are disposed adjacent the periphery of each disc. The latter grinding surfaces are shown, as comprising fiat smooth sur- 40 faces that are annular in shape and. that extend inwardly a considerable distance from the marginal edges; in fact, they extend inwardly substantially one-half of the distance between the inner and outer diameters of the disc. In this way, I obtain a grinding action, when applied to coal, that will grind it so fine it will pass through a 200 mesh sieve. For purposes of economy in manufacture, the discs are interchangeable.

For this purpose the faces of the disc on which the ribs are located are frustro-conical in shape with the faces adjacent each other hollowed out so that the two faces cooperate to provide passageways along which the material is fed, as it passes outwardly and radially between the discs.

To avoid the formation of grooves in the discs by the moving material, I mount each disc eccentrically upon the supporting lugs. The slight degree of eccentricity also aids in obtaining a more finely ground product.

From the foregoing description, it will be apparent that my invention has resulted in a more compact machine that may be economically operated and that will pulverize coal to an extremely fine degree.

Iclaim:

1. In a pulverizing machine, a housingniade in two parts detachably secured together and having oppositely facing recesses respectively containing relatively eccentric grinding elements having annular face surfaces which are held in operative contact by the end wall surfaces of the recesses, separate drivingmeans for said elements extending from one housing part and connected with respective elements, the other housing part havinga hopper-formed therein with a circular opening which forms an efiective support forone of the grinding elements the latter element having a through passage which admits material from the hopper, throughsaid circular opening, to a position enabling the. material to be ground by said annular face surfaces of the said elements.

2. A pulverizer, comprising in combination a frame having spaced, upright members thereon, one member being relatively enlarged and circularly recessed to form part of a housing for a grinding disc, a hollow body having a hopper chamber formed therein, said body having a circular recess facing the circular recess of said enlarged portion of the frame in a manner to complete said housing, means to secure said body to the frame, a shaft journalled in one of said upright 'members and extending into the musing, asleeve'journalled in the other upright member, surrounding the shaft and partially supporting it, separate driving members attached ,tothe shaft and sleeve respectively, and located in the space between said upright members, a

pair of -driving discs on said sleeve and shaft 

